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EspritCombi
(@espritcombi)
Active Member
No MMU2S on my PC...

Hello everybody !

I need you help please... my MMU2S doesn't work 🙁

I assembled the MK3S, then chained it to the MMU2S. I flashed the firmware on the MK3S without any problems. My PC immediately detected the printer. I have made all the settings and printed the test lines, the square is perfect !!!!!
But the problem is the MMU2S; I plug the micro usb on print, and usb on the PC, and nothing happens at all! There's nothing I can do.... I tried the various manipulations I could find; nothing works... Once I had all the LEDs (green and red) on continuously, then nothing...
I don't know what to do anymore, everything's new!

Thank you in advance for your precious help!

This topic was modified 5 years ago by EspritCombi
Posted : 01/08/2019 6:14 pm
Nikolai
(@nikolai)
Noble Member
RE: No MMU2S on my PC...

What exactly are you trying to do?

Often linked posts:
Going small with MMU2
Real Multi Material
My prints on Instagram

Posted : 02/08/2019 11:14 pm
Dave Avery
(@dave-avery)
Honorable Member
RE: No MMU2S on my PC...

you don't need to connect to the micro-usb except to flash a new version of the MMU-control firmware

Posted : 03/08/2019 1:35 am
EspritCombi
(@espritcombi)
Active Member
Topic starter answered:
RE: No MMU2S on my PC...

I just finished the assembly of MK3S and MMU2S in one time. I flash the right firmware on the MK3S : all is ok (configuration, calibration,...). I used "prusa3d_fw_MK3S_3_7_2_2363.hex". And after, i connect the MMU2S with micro usb on my PC, to flash the firmware for MMU : "prusa3d_fw_MMU2board_1_0_5.hex" but nothing appens... My PC doesn't see the MMU port COM... Drivers don't seem to work....

It's not to flash a new version of the MMU-control firmware, but just for the first utilisation...

This post was modified 5 years ago by EspritCombi
Posted : 03/08/2019 10:29 am
JoanTabb
(@joantabb)
Veteran Member Moderator
RE: No MMU2S on my PC...

Hi Thomas, 
have you disconnected the usb to mk3 cable, so that you only have the cable connected to the MMU2,
and then,

clicked the Rescan button?

regards Joan

I try to make safe suggestions,You should understand the context and ensure you are happy that they are safe before attempting to apply my suggestions, what you do, is YOUR responsibility. Location Halifax UK

Posted : 03/08/2019 2:45 pm
gnat
 gnat
(@gnat)
Noble Member
RE: No MMU2S on my PC...

Since you mentioned that you did have lights on the MMU, but don't anymore, power up the printer and go into it's support menu. Scroll down and you want to find a section that tells you that the MMU2 is connected and what it's firmware version is. If you do not find that, then the printer and MMU aren't seeing each other correctly and the source of that problem is also likely the reason you can't find the serial port.

MMU tips and troubleshooting
Posted : 03/08/2019 3:26 pm
EspritCombi
(@espritcombi)
Active Member
Topic starter answered:
RE: No MMU2S on my PC...

Hi !

I connected the MK3 for its firmware, i deconnected it for connected only the MMU.

And nothing append when i rescan, my computer doesn't detect anything :(..

On MK3 screen, i have "MMU2 N/A" and actually i don't have any light on the MMU, and buttons don't do any action...

I have however disconnected everything on the electronic board of the MK3, reconnect everything, but nothing says that the MMU is there

Posted : 04/08/2019 6:01 pm
Nikolai
(@nikolai)
Noble Member
RE: No MMU2S on my PC...

I can recommend to contact Prusa Live Support. They will guide your through the troubleshooting steps and provide you with replacements if required.

Often linked posts:
Going small with MMU2
Real Multi Material
My prints on Instagram

Posted : 04/08/2019 6:07 pm
EspritCombi
(@espritcombi)
Active Member
Topic starter answered:
RE: No MMU2S on my PC...

Hello, I contacted Douglas from the support, he sends me new power cables, I hope it will work!!!

Posted : 14/08/2019 8:48 am
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